TCRs and recombinases

I have a couple questions for anyone to help me out with. Does anyone
know what the function of the gamma-delta T Cell receptor (TCR) is that
makes it unique from the alpha-beta TCR? And, what is the biochemical
mechanism behind the interaction of a DNA recombinase and a recombinase
activating gene (RAG)?
Christopher T. Lang
FishPuddin at aol.com